Polyaluminum chloride sewage treatment device for sewage treatment

Abstract

The invention belongs to the technical field of sewage treatment equipment, and particularly relates to a polyaluminum chloride sewage treatment device for sewage treatment, which comprises a coagulation mechanism, a chemical feeder, a flocculation mechanism, an air dissolving head and an air flotation treatment mechanism, the coagulation mechanism comprises a coagulation box and an abnormal wave folded plate, the abnormal wave folded plate is fixedly arranged in the coagulation box, and the chemical feeder is arranged in the coagulation box. A cavity of the coagulation box is divided into continuous water channels by the different-wave folded plate, the chemical feeding device is mounted on the coagulation box, the flocculation mechanism comprises a flocculation pipe and a gas dissolving pipe, the flocculation pipe and the gas dissolving pipe are horizontally arranged, and the liquid outlet pipe, the flocculation pipe and the gas dissolving pipe are sequentially connected through pipelines. The air dissolving head is installed at the end, away from the air flotation treatment mechanism, of the air dissolving pipe, the bottom of the air flotation treatment mechanism is connected with the air dissolving pipe through a pipeline, through a floc cultivation environment self-driven by hydraulic power, damage of strong shear force to micro floc is avoided, and the problem that a stirring mechanism of the stirring equipment continuously destroys the floc structure is effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment equipment, and in particular relates to a polyaluminium chloride sewage treatment device for sewage treatment. Background Art

[0002] In municipal and industrial wastewater treatment, polyaluminium chloride (PAC) is widely used in coagulation and flocculation processes due to its excellent charge neutralization and bridging flocculation capabilities. The current mainstream technology utilizes a multi-stage series reaction tank structure. After being dosed, wastewater first enters the coagulation tank, where high-speed rotation rapidly disperses the PAC and initially forms microflocculates. The wastewater then flows into the flocculation tank, where gradually decelerating agitation promotes the growth and aggregation of the flocs. Finally, solid-liquid separation is achieved through flotation or sedimentation units. This process is widely used in the treatment of wastewater containing high levels of suspended solids.

[0003] However, the mechanical stirring equipment commonly used in existing equipment causes continuous damage to the floc structure. The shear force generated by high-speed stirring will tear the core of the micro-flocs formed in the early stage of coagulation, resulting in a loose structure of the alum flocs and uneven density. In the flocculation stage, the slow stirring blades will push some of the flocs to settle to the bottom of the pool. This reduces the amount of light flocs generated and increases the proportion of heavy flocs, resulting in the subsequent flotation unit's capture efficiency of suspended matter. In addition, traditional equipment usually directly adds powdered or liquid polyaluminum chloride directly into the wastewater, and accelerates the mixing of polyaluminum chloride and wastewater through the stirring mechanism, but this mode will affect the diffusion efficiency of polyaluminum chloride and wastewater.

[0004] Therefore, it is necessary to study a polyaluminum chloride sewage treatment device for sewage treatment that can fully stir the wastewater and polyaluminum chloride to improve the diffusion efficiency of polyaluminum chloride and prevent the continuous destruction of the floc structure. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a polyaluminum chloride sewage treatment device for sewage treatment, which is used to solve the problem that the existing equipment will continuously destroy the floc structure during the sewage treatment process.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A polyaluminium chloride sewage treatment device for sewage treatment, comprising: a coagulation mechanism, a dosing device, a flocculation mechanism, an air dissolving head and an air flotation treatment mechanism;

[0008] The coagulation mechanism includes a coagulation box and a corrugated plate. The coagulation box is a hollow shell. A first liquid inlet pipe and a liquid outlet pipe are provided on the coagulation box. The corrugated plate is fixedly arranged in the coagulation box and divides the cavity of the coagulation box into continuous waterways.

[0009] The dosing device is installed behind the first liquid inlet pipe and is used to add liquid polyaluminium chloride into the sewage;

[0010] The flocculation mechanism includes a flocculation tube, an air dissolving tube, an air compressor and a circulation pump. The flocculation tube and the air dissolving tube are both arranged horizontally. The liquid outlet pipe, the flocculation tube and the air dissolving tube are connected in sequence through pipes. The air dissolving tube is provided with a liquid separation valve.

[0011] The air dissolving head is installed at one end of the air dissolving pipe away from the air flotation treatment mechanism;

[0012] The bottom of the air flotation treatment mechanism is connected to the air dissolving pipe through a pipeline.

[0013] Furthermore, the dosing device includes a drug inlet pipe, a first water distribution pipe, a liquid inlet end, a liquid outlet end and an impeller assembly. The first water distribution pipe is connected to the liquid separation valve through a pipeline, the drug inlet pipe is connected to the first water distribution pipe, the liquid inlet end is arranged on the side of the dosing device close to the first liquid inlet pipe, and the liquid outlet end is arranged on the side of the dosing device away from the first liquid inlet pipe. Filter holes are provided on the liquid inlet end and the liquid outlet end, and the impeller assembly is rotatably arranged on the dosing device.

[0014] Furthermore, the impeller assembly includes a driving impeller and a mixing impeller, and the driving impeller and the mixing impeller are fixedly connected.

[0015] Furthermore, the first water distribution pipe is provided with a first water distribution port inclined downward, and the position of the first water distribution port corresponds to the driving impeller.

[0016] Furthermore, the medicine dispenser further comprises an exhaust pipe, which is located between the impeller assembly and the liquid outlet.

[0017] Furthermore, the liquid inlet end is a slope with an upper end inclined toward the flow direction of the sewage.

[0018] Furthermore, a second water distribution pipe is provided on the folded plate, the second water distribution pipe is connected to the liquid separation valve through a pipeline, and a second water distribution port is provided on the second water distribution pipe, and the second water distribution port is inclined toward the flow direction of the sewage.

[0019] Furthermore, the air dissolving head includes a second liquid inlet pipe, an air inlet pipe and a valve core. A mixing chamber and a diversion chamber are provided on the air dissolving head. The diversion chamber is arranged on a side close to the air dissolving pipe. The mixing chamber is communicated with the diversion chamber. The mixing chamber is connected to the second liquid inlet pipe and the air inlet pipe. The second liquid inlet pipe is connected to the flotation treatment mechanism through a pipeline and a circulation pump. The air inlet pipe is connected to the air compressor through a pipeline. The valve core is fixedly arranged in the diversion chamber, and there is a gap between the valve core and the inner wall of the diversion chamber.

[0020] Furthermore, the flotation treatment mechanism includes a first slag discharge pipe, a scraper assembly, a second slag discharge pipe, a water collecting pipe, a clean water chamber and a first drain pipe. The first slag discharge pipe is arranged at the bottom of the flotation treatment mechanism, the scraper assembly and the second slag discharge pipe are arranged above the flotation treatment mechanism, the clean water chamber is arranged on the side of the flotation treatment mechanism away from the flocculation mechanism, the water collecting pipe is arranged in the flotation treatment mechanism and connected to the clean water chamber, and the clean water chamber is provided with a first drain pipe.

[0021] Furthermore, a second drainage pipe is provided on the water purification chamber, and the second drainage pipe is connected to the circulation pump through a pipeline.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention discloses a polyaluminium chloride sewage treatment device for sewage treatment, which realizes efficient diffusion of polyaluminium chloride through a hydraulically self-driven floc cultivation environment and directional turbulence generated by a corrugated plate, while avoiding the destruction of micro-flocs by strong shear forces, ensuring a dense floc core structure and uniform particle size, and effectively solving the problem of continuous destruction of the floc structure by the stirring mechanism of Chuanrong equipment.

[0024] 2. The present invention discloses a polyaluminum chloride sewage treatment device for sewage treatment. The entire system has no rotating mechanical seal structure, which fundamentally avoids wear and scaling failures caused by corrosive media, extends the life of key components, reduces the frequency of operation and maintenance, and greatly reduces the overall cost of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0026] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0027] Figure 3 It is a structural diagram of the coagulation mechanism and the flocculation mechanism;

[0028] Figure 4 for Figure 3 Cross-section along line AA;

[0029] Figure 5 for Figure 4 The enlarged structural diagram at C in the middle;

[0030] Figure 6 Schematic diagram of the structure of the drug dispenser Figure 1 ;

[0031] Figure 7 Schematic diagram of the structure of the drug dispenser Figure 2 ;

[0032] Figure 8 Schematic diagram of the structure of the impeller assembly;

[0033] Figure 9 for Figure 3 Cross-section along line BB;

[0034] Figure 10 for Figure 9 Enlarged structural diagram at point D in the middle.

[0035] The reference numerals involved in the accompanying drawings are:

[0036] 1. Coagulation mechanism; 11. Coagulation tank; 111. First liquid inlet pipe; 12. Corrugated plate; 121. Second water distribution pipe; 122. Second water distribution outlet; 13. Liquid outlet pipe; 2. Dosing device; 21. Drug inlet pipe; 22. First water distribution pipe; 221. First water distribution outlet; 23. Exhaust pipe; 24. Liquid inlet; 25. Liquid outlet; 26. Filter hole; 27. Impeller assembly; 271. Drive impeller; 272. Mixing impeller; 3. Flocculation machine Structure; 31. Flocculation tube; 32. Dissolving air tube; 321. Liquid separation valve; 33. Air compressor; 34. Circulation pump; 4. Dissolving air head; 41. Second liquid inlet pipe; 42. Air inlet pipe; 43. Mixing chamber; 44. Diverter chamber; 45. Valve core; 5. Flotation treatment mechanism; 51. First slag discharge pipe; 52. Scraper assembly; 53. Second slag discharge pipe; 54. Water collecting pipe; 55. Clean water chamber; 56. First drain pipe; 57. Second drain pipe. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0038] In the description of this application, it should be noted that for directional words, such as the terms "center", "horizontal", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, the directions and positional relationships indicated are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of this application.

[0039] It should be noted that the terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0040] See also Figures 1 to 10As shown, a polyaluminium chloride sewage treatment device for sewage treatment includes: a coagulation mechanism 1 for achieving rapid dispersion of liquid polyaluminium chloride and preliminary formation of microflocculations, a dosing device 2 for fully mixing sewage and liquid polyaluminium chloride, a flocculation mechanism 3 and a dissolved air head 4 for the growth and aggregation of alum flocs and dissolved air, and a flotation treatment mechanism 5 for achieving solid-liquid separation.

[0041] The dosing device 2 is installed at the rear of the first liquid inlet pipe 111 and is used to add liquid polyaluminium chloride into the sewage. Specifically, the dosing device 2 includes a drug inlet pipe 21, a first water distribution pipe 22, a liquid inlet end 24, a liquid outlet end 25 and an impeller assembly 27. The first water distribution pipe 22 is connected to the liquid separation valve 321 through a pipeline, and the drug inlet pipe 21 is connected to the first water distribution pipe 22. It can be understood that the sewage in the air dissolving pipe 32 of the flocculation mechanism 3 enters the first water distribution pipe 22 through the liquid separation valve 321 and the pipeline, and the liquid polyaluminium chloride enters the first water distribution pipe 22 through the drug inlet pipe 21 and contacts and mixes with the sewage with a higher flow rate, thereby reducing the concentration of the liquid polyaluminium chloride while increasing its flow rate. The liquid inlet end 24 is arranged on the side of the dosing device 2 close to the first liquid inlet pipe 111, and the liquid outlet end 25 is arranged on the side of the dosing device 2 away from the first liquid inlet pipe 111. The liquid inlet end 24 and the liquid outlet end 25 are provided with filter holes 26. It should be noted that, in this embodiment, the liquid inlet end 24 is an inclined surface with the upper end inclined in the direction of sewage flow, which can increase the contact area between the liquid inlet end 24 and the sewage, increase the efficiency of sewage entering the dosing device 2, and prevent the filter holes 26 on the liquid inlet end 24 from being blocked.

[0042] The impeller assembly 27 is rotatably arranged on the dosing device 2. Specifically, the impeller assembly 27 includes a driving impeller 271 and a mixing impeller 272. The driving impeller 271 and the mixing impeller 272 are fixedly connected. In this embodiment, the driving impeller 271 is a radial impeller, and the mixing impeller 272 is an axial impeller. Correspondingly, a downwardly inclined first water distribution port 221 is provided on the first water distribution pipe 22, and the position of the first water distribution port 221 corresponds to the driving impeller 271. It can be understood that the mixture of liquid polyaluminum chloride and sewage in the first water distribution pipe 22 is sprayed onto the driving impeller 271 through the downwardly inclined first water distribution port 221, and the mixed liquid impacts the driving impeller 271 to rotate it, thereby driving the mixing impeller 272 to rotate. The mixture of liquid polyaluminium chloride and sewage contacts the driving impeller 271 and mixes with the sewage entering the dosing device 2 through the filter hole 26, and flows to the liquid outlet end 25 with the sewage. During the flow, the mixing impeller 272 stirs it so that the liquid polyaluminium chloride and sewage are fully mixed, and then it is discharged into the sewage through the filter hole 26 on the liquid outlet end 25.

[0043] Specifically, the dosing device 2 further includes an exhaust pipe 23, which is located between the impeller assembly 27 and the liquid outlet 25. It can be understood that the bubbles contained in the sewage diverted by the liquid separation valve 321 and the bubbles generated when the liquid polyaluminum chloride and sewage mixture impacts the driving impeller 271 can be promptly discharged through the exhaust pipe 23.

[0044] In some embodiments, a plurality of dosing devices 2 are installed on the coagulation tank 11 according to different types of drugs and dosing methods, and the plurality of dosing devices 2 are arranged in parallel along the water channel in the coagulation tank 11 .

[0045] The coagulation mechanism 1 includes a coagulation tank 11 and a corrugated plate 12. The coagulation tank 11 is a hollow shell, and a first liquid inlet pipe 111 and a liquid outlet pipe 13 are provided on the coagulation tank 11. It should be noted that the first liquid inlet pipe 111 is located at the bottom of the coagulation tank 11, and the liquid outlet pipe 13 is located above the coagulation tank 11. The corrugated plate 12 is fixedly arranged in the coagulation tank 11, and the corrugated plate 12 divides the cavity of the coagulation tank 11 into a continuous waterway. The vortex-forming effect of the corrugated plate 12 improves the distribution of turbulent energy consumption in the waterway, thereby improving the flocculation effect. Correspondingly, the first liquid inlet pipe 111 and the liquid outlet pipe 13 are respectively connected to the two ends of the waterway.

[0046] Specifically, the folded plate 12 is provided with a second water distribution pipe 121, which is connected to the liquid separation valve 321 via a pipe. A second water distribution port 122 is provided on the second water distribution pipe 121, and the second water distribution port 122 is inclined in the direction of the sewage flow. It can be understood that the sewage diverted from the liquid separation valve 321 is sprayed into the waterway of the coagulation tank 11 through the second water distribution port 122. This can further enhance the mixing of liquid polyaluminum chloride and sewage without sacrificing the vortex-forming effect of the folded plate 12. At the same time, it can remove aluminum flocs deposited in the troughs of the folded plate 12, preventing aluminum floc deposition.

[0047] The flocculation mechanism 3 includes a flocculation tube 31, an air dissolving tube 32, an air compressor 33, and a circulation pump 34. The flocculation tube 31 and the air dissolving tube 32 are both arranged horizontally. The liquid outlet pipe 13, the flocculation tube 31, and the air dissolving tube 32 are sequentially connected by pipes. The air dissolving tube 32 is provided with a liquid separation valve 321. It can be understood that the alum flocs in the flocculation tube 31 further grow and aggregate, then enter the air dissolving tube 32, mix with the air-dissolving water ejected from the air dissolving head 4, and increase the flow rate.

[0048] The air dissolving head 4 is installed at one end of the air dissolving tube 32 away from the flotation treatment mechanism 5. Specifically, the air dissolving head 4 includes a second liquid inlet pipe 41, an air inlet pipe 42 and a valve core 45. The air dissolving head 4 is provided with a mixing chamber 43 and a diversion chamber 44. The diversion chamber 44 is provided on a side close to the air dissolving tube 32. The mixing chamber 43 is communicated with the diversion chamber 44. The mixing chamber 43 is connected to the second liquid inlet pipe 41 and the air inlet pipe 42. The second liquid inlet pipe 41 is connected to the flotation treatment mechanism 5 through a pipeline and a circulation pump 34. The air inlet pipe 42 is connected to the air compressor 33 through a pipeline. The valve core 45 is fixedly provided in the diversion chamber 44. There is a gap between the valve core 45 and the inner wall of the diversion chamber 44. It can be understood that the purified water in the clean water chamber 55 of the flotation treatment mechanism 5 enters the mixing chamber 43 through the second drain pipe 57, the circulation pump 34, the second liquid inlet pipe 41 and the pipeline. At the same time, the air compressor 33 pumps the compressed gas into the mixing chamber 43 through the pipeline and the air inlet pipe 42. In the mixing chamber 43, the water and air collide to produce aerosolized water, which enters the diversion chamber 44, passes through the gap between the inner wall of the diversion chamber 44 and the valve core 45, enters the air dissolution pipe 32 and mixes with the sewage.

[0049] It should be noted that in this embodiment, the air dissolving head 4 has two sets of flocculation tubes 31 and air dissolving tubes 32, wherein the air dissolving tubes 32 of one set are connected to the flocculation tubes 31 of the other set via a pipe, and the liquid separation valve 321 is provided on the air dissolving tubes 32 directly connected to the flotation treatment mechanism 5. In some embodiments, the flocculation tubes 31 and air dissolving tubes 32 of the flocculation mechanism 3 can be a set.

[0050] The bottom of the flotation treatment mechanism 5 is connected to the air dissolution pipe 32 via a pipeline. The flotation treatment mechanism 5 includes a first slag discharge pipe 51, a scraper assembly 52, a second slag discharge pipe 53, a water collection pipe 54, a clean water chamber 55, and a first drain pipe 56. The first slag discharge pipe 51 is arranged at the bottom of the flotation treatment mechanism 5, the scraper assembly 52 and the second slag discharge pipe 53 are arranged above the flotation treatment mechanism 5, the clean water chamber 55 is arranged on the side of the flotation treatment mechanism 5 away from the flocculation mechanism 3, the water collection pipe 54 is arranged in the flotation treatment mechanism 5 and connected to the clean water chamber 55, and the clean water chamber 55 is provided with a first drain pipe 56.

[0051] The water purification chamber 55 is further provided with a second drainage pipe 57 , which is connected to the circulation pump 34 through a pipeline.

[0052] It can be understood that the sewage in the dissolved air pipe 32 enters the flotation treatment mechanism 5, some impurities settle to the bottom of the flotation treatment mechanism 5, and are discharged from the first slag discharge pipe 51; part rises to the top of the flotation treatment mechanism 5, is scraped by the scraper assembly 52 to the second slag discharge pipe 53 and discharged; the treated water enters the clean water chamber 55 through the water collecting pipe 54, part of it is discharged through the first drain pipe 56, and the other part enters the dissolved air head 4 through the second drain pipe 57.

[0053] The working principle of the present invention is as follows:

[0054] The reagents are premixed and added, and the sewage in the air dissolving pipe 32 is diverted to the first water distribution pipe 22 through the liquid separation valve 321. The liquid polyaluminium chloride is injected into the first water distribution pipe 22 through the drug inlet pipe 21 and preliminarily diluted and mixed with the high-speed water flow; the mixed liquid is ejected through the downward-inclined first water distribution port 221 to impact the driving impeller 271, driving the mixing impeller 272 to rotate; the rotating impeller mixes the mixed liquid with the sewage entering the dosing device 2 through the filter hole 26 for a second time, and then sprayed into the main sewage flow through the filter hole at the liquid outlet 25.

[0055] During hydraulic coagulation, sewage carrying polyaluminium chloride enters the waterway of the coagulation tank 11 and flows along the zigzag waterway formed by the zigzag plate 12. The zigzag plate 12 generates controllable turbulence, promoting the diffusion of PAC and the formation of micro-floc nuclei. The second water distribution pipe 121 sprays and diverts sewage to enhance mixing and flush out trough sediments.

[0056] Flocculation and dissolved air, sewage enters the flocculation tube 31 through the liquid outlet pipe 13, and completes the growth of alum flowers under relatively low-speed flow; the treated water in the clean water chamber 55 of the float treatment mechanism 5 enters the mixing chamber 43 through the second drain pipe 57, the circulation pump 34, the second liquid inlet pipe 41 and the pipeline, and at the same time the air compressor 33 pumps the compressed gas into the mixing chamber 43 through the pipeline and the air inlet pipe 42. In the mixing chamber 43, the water and air collide to produce aerosolized water, which enters the diversion chamber 44, passes through the gap between the inner wall of the diversion chamber 44 and the valve core 45, enters the dissolved air pipe 32 and mixes with the sewage.

[0057] Flotation separation: the sewage in the dissolved air pipe 32 enters the flotation treatment mechanism 5, and some impurities settle to the bottom of the flotation treatment mechanism 5 and are discharged from the first slag discharge pipe 51; part rises to the top of the flotation treatment mechanism 5 and is scraped by the scraper assembly 52 to the second slag discharge pipe 53 for discharge; the treated water enters the clean water chamber 55 through the water collecting pipe 54, part of it is discharged through the first drain pipe 56, and the other part enters the dissolved air head 4 through the second drain pipe 57.

[0058] The above is only an embodiment of the present invention. Common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the guidance of this application. Some typical well-known structures or well-known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A polyaluminium chloride sewage treatment device for sewage treatment, characterized in that: include: Coagulation mechanism (1), dosing device (2), flocculation mechanism (3), air dissolving head (4) and air flotation treatment mechanism (5); The coagulation mechanism (1) comprises a coagulation box (11) and a corrugated plate (12); the coagulation box (11) is a hollow shell; a first liquid inlet pipe (111) and a liquid outlet pipe (13) are provided on the coagulation box (11); the corrugated plate (12) is fixedly arranged in the coagulation box (11); the corrugated plate (12) divides the cavity of the coagulation box (11) into continuous waterways; The dosing device (2) is installed behind the first liquid inlet pipe (111) and is used to add liquid polyaluminium chloride into the sewage; The flocculation mechanism (3) comprises a flocculation tube (31), an air dissolving tube (32), an air compressor (33) and a circulation pump (34); the flocculation tube (31) and the air dissolving tube (32) are both arranged horizontally; the liquid outlet pipe (13), the flocculation tube (31) and the air dissolving tube (32) are sequentially connected through pipelines; and a liquid separation valve (321) is provided on the air dissolving tube (32); The air dissolving head (4) is installed at one end of the air dissolving pipe (32) away from the air flotation treatment mechanism (5); The bottom of the air flotation treatment mechanism (5) is connected to the air dissolving pipe (32) through a pipeline.

2. A polyaluminium chloride sewage treatment device for sewage treatment according to claim 1, characterized in that: The dosing device (2) comprises a drug inlet pipe (21), a first water distribution pipe (22), a liquid inlet end (24), a liquid outlet end (25) and an impeller assembly (27). The first water distribution pipe (22) is connected to a liquid separation valve (321) through a pipeline. The drug inlet pipe (21) is connected to the first water distribution pipe (22). The liquid inlet end (24) is arranged on a side of the dosing device (2) close to the first liquid inlet pipe (111). The liquid outlet end (25) is arranged on a side of the dosing device (2) away from the first liquid inlet pipe (111). Filter holes (26) are provided on the liquid inlet end (24) and the liquid outlet end (25). The impeller assembly (27) is rotatably arranged on the dosing device (2).

3. A polyaluminium chloride sewage treatment device for sewage treatment according to claim 2, characterized in that: The impeller assembly (27) comprises a driving impeller (271) and a mixing impeller (272), and the driving impeller (271) and the mixing impeller (272) are fixedly connected.

4. A polyaluminium chloride sewage treatment device for sewage treatment according to claim 3, characterized in that: The first water distribution pipe (22) is provided with a first water distribution port (221) inclined downward, and the position of the first water distribution port (221) corresponds to the driving impeller (271).

5. A polyaluminium chloride sewage treatment device for sewage treatment according to claim 2, characterized in that: The medicine dispenser (2) further comprises an exhaust pipe (23), and the exhaust pipe (23) is located between the impeller assembly (27) and the liquid outlet (25).

6. A polyaluminium chloride sewage treatment device for sewage treatment according to claim 2, characterized in that: The liquid inlet end (24) is a slope with an upper end inclined toward the flow direction of the sewage.

7. A polyaluminium chloride sewage treatment device for sewage treatment according to claim 1, characterized in that: A second water distribution pipe (121) is provided on the folded plate (12), the second water distribution pipe (121) is connected to the liquid separation valve (321) through a pipeline, and a second water distribution port (122) is provided on the second water distribution pipe (121), and the second water distribution port (122) is inclined in the direction of sewage flow.

8. A polyaluminium chloride sewage treatment device for sewage treatment according to claim 1, characterized in that: The air dissolving head (4) comprises a second liquid inlet pipe (41), an air inlet pipe (42) and a valve core (45). The air dissolving head (4) is provided with a mixing chamber (43) and a diversion chamber (44). The diversion chamber (44) is provided on a side close to the air dissolving pipe (32). The mixing chamber (43) is communicated with the diversion chamber (44). The mixing chamber (43) is connected to the second liquid inlet pipe (41) and the air inlet pipe (42). The second liquid inlet pipe (41) is connected to the air flotation treatment mechanism (5) through a pipeline and a circulation pump (34). The air inlet pipe (42) is connected to the air compressor (33) through a pipeline. The valve core (45) is fixedly provided in the diversion chamber (44). There is a gap between the valve core (45) and the inner wall of the diversion chamber (44).

9. A polyaluminium chloride sewage treatment device for sewage treatment according to claim 1, characterized in that: The flotation treatment mechanism (5) comprises a first slag discharge pipe (51), a scraper assembly (52), a second slag discharge pipe (53), a water collecting pipe (54), a clean water chamber (55) and a first drainage pipe (56); the first slag discharge pipe (51) is arranged at the bottom of the flotation treatment mechanism (5); the scraper assembly (52) and the second slag discharge pipe (53) are arranged above the flotation treatment mechanism (5); the clean water chamber (55) is arranged on a side of the flotation treatment mechanism (5) away from the flocculation mechanism (3); the water collecting pipe (54) is arranged in the flotation treatment mechanism (5) and connected to the clean water chamber (55); and the clean water chamber (55) is provided with a first drainage pipe (56).

10. A polyaluminium chloride sewage treatment device for sewage treatment according to claim 8, characterized in that: The water purification chamber (55) is further provided with a second drainage pipe (57), and the second drainage pipe (57) is connected to the circulation pump (34) through a pipeline.

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